Search Publications
Filament identification through mathematical morphology
Koch, Eric W.; Rosolowsky, Erik W.
We present a new algorithm for detecting filamentary structure FILFINDER. The algorithm uses the techniques of mathematical morphology for filament identification, presenting a complementary approach to current algorithms which use matched filtering or critical manifolds. Unlike other methods, FILFINDER identifies filaments over a wide dynamic ran…
A remarkably flat relationship between the average star formation rate and AGN luminosity for distant X-ray AGN
Alexander, D. M.; Swinbank, A. M.; Del Moro, A. +5 more
In this study, we investigate the relationship between the star formation rate (SFR) and AGN luminosity (L_AGN) for ∼2000 X-ray detected AGN. The AGN span over three orders of magnitude in X-ray luminosity (10^{42} < L_{2-8 keV} < 10^{45.5} erg s^{-1}) and are in the redshift range z = 0.2-2.5. Using infrared (IR) photometry (8-500 µ m…
The nature of the [C II] emission in dusty star-forming galaxies from the SPT survey
Béthermin, M.; Murphy, E. J.; Greve, T. R. +24 more
We present [C II] observations of 20 strongly lensed dusty star-forming galaxies at 2.1 < z < 5.7 using Atacama Pathfinder EXperiment and Herschel. The sources were selected on their 1.4 mm flux (S1.4 mm > 20 mJy) from the South Pole Telescope (SPT) survey, with far-infrared (FIR) luminosities determined from extensive photomet…
Large-scale filaments associated with Milky Way spiral arms
Ginsburg, Adam; Wang, Ke; Testi, Leonardo +3 more
The ubiquity of filamentary structure at various scales throughout the Galaxy has triggered a renewed interest in their formation, evolution, and role in star formation. The largest filaments can reach up to Galactic scale as part of the spiral arm structure. However, such large-scale filaments are hard to identify systematically due to limitation…
The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population
White, G. J.; André, Ph.; Könyves, V. +59 more
In this paper, we present the first observations of the Ophiuchus molecular cloud performed as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) with the SCUBA-2 instrument. We demonstrate methods for combining these data with previous HARP CO, Herschel, and IRAM N2H+ observations in order to accurately…
The timing and location of dust formation in the remnant of SN 1987A
Barlow, M. J.; Wesson, R.; Matsuura, M. +1 more
The discovery with the Herschel Space Observatory of bright far-infrared and submm emission from the ejecta of the core-collapse supernova SN 1987A has been interpreted as indicating the presence of some 0.4-0.7 M⊙ of dust. We have constructed radiative transfer models of the ejecta to fit optical to far-infrared observations from the l…
Temperature as a third dimension in column-density mapping of dusty astrophysical structures associated with star formation
Marsh, K. A.; Whitworth, A. P.; Lomax, O.
We present point process mapping (<monospace>PPMAP</monospace>), a Bayesian procedure that uses images of dust continuum emission at multiple wavelengths to produce resolution-enhanced image cubes of differential column density as a function of dust temperature and position. <monospace>PPMAP</monospace> is based on the gene…
ALMA and Herschel reveal that X-ray-selected AGN and main-sequence galaxies have different star formation rate distributions
Daddi, E.; Elbaz, D.; Dickinson, M. +15 more
Using deep Herschel and ALMA observations, we investigate the star formation rate (SFR) distributions of X-ray-selected active galactic nucleus (AGN) host galaxies at 0.5 < z < 1.5 and 1.5 < z < 4, comparing them to that of normal, star-forming (i.e. `main-sequence', or MS) galaxies. We find that 34-55 per cent of AGNs in our sample ha…
Decreased specific star formation rates in AGN host galaxies
Koss, Michael; Mushotzky, Richard F.; Rosario, David J. +2 more
We investigate the location of an ultra-hard X-ray selected sample of active galactic nuclei (AGN) from the Swift Burst Alert Telescope (BAT) catalogue with respect to the main sequence (MS) of star-forming galaxies using Herschel-based measurements of the star formation rate (SFR) and M*'s from Sloan Digital Sky Survey photometry where…
The evolution of the cold interstellar medium in galaxies following a starburst
da Cunha, E.; Nesvadba, N.; Mortier, A. +4 more
We present the evolution of dust and molecular gas properties in a sample of 11 z ∼ 0.03 starburst to post-starburst (PSB) galaxies selected to span an age sequence from ongoing starburst to 1 Gyr after the starburst ended. All PSBs harbour significant molecular gas and dust reservoirs and residual star formation, indicating that complete quenchin…